US4918426A - Method and apparatus for sensing fluid flow volume to indicate end of filter life - Google Patents
Method and apparatus for sensing fluid flow volume to indicate end of filter life Download PDFInfo
- Publication number
- US4918426A US4918426A US07/189,342 US18934288A US4918426A US 4918426 A US4918426 A US 4918426A US 18934288 A US18934288 A US 18934288A US 4918426 A US4918426 A US 4918426A
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- United States
- Prior art keywords
- signal
- generating
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- flow
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000012530 fluid Substances 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000012544 monitoring process Methods 0.000 claims abstract description 9
- 230000003213 activating effect Effects 0.000 claims description 13
- 239000012535 impurity Substances 0.000 claims description 8
- 230000004044 response Effects 0.000 claims description 8
- 239000000356 contaminant Substances 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 238000000746 purification Methods 0.000 claims description 2
- 230000008878 coupling Effects 0.000 claims 2
- 238000010168 coupling process Methods 0.000 claims 2
- 238000005859 coupling reaction Methods 0.000 claims 2
- 230000000737 periodic effect Effects 0.000 claims 2
- 238000005259 measurement Methods 0.000 abstract description 2
- 238000009434 installation Methods 0.000 abstract 1
- 230000009977 dual effect Effects 0.000 description 9
- 239000003990 capacitor Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 239000003610 charcoal Substances 0.000 description 2
- 208000032953 Device battery issue Diseases 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
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- 238000012372 quality testing Methods 0.000 description 1
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Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/07—Integration to give total flow, e.g. using mechanically-operated integrating mechanism
- G01F15/075—Integration to give total flow, e.g. using mechanically-operated integrating mechanism using electrically-operated integrating means
- G01F15/0755—Integration to give total flow, e.g. using mechanically-operated integrating mechanism using electrically-operated integrating means involving digital counting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/60—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor integrally combined with devices for controlling the filtration
- B01D29/603—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor integrally combined with devices for controlling the filtration by flow measuring
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/88—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices
- B01D29/92—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for discharging filtrate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/14—Safety devices specially adapted for filtration; Devices for indicating clogging
- B01D35/143—Filter condition indicators
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
- G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
- G01F1/363—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction with electrical or electro-mechanical indication
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2201/00—Details relating to filtering apparatus
- B01D2201/20—Pressure-related systems for filters
- B01D2201/204—Systems for applying vacuum to filters
- B01D2201/208—Systems for applying vacuum to filters by venturi systems
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
Description
Claims (21)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/189,342 US4918426A (en) | 1988-05-02 | 1988-05-02 | Method and apparatus for sensing fluid flow volume to indicate end of filter life |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/189,342 US4918426A (en) | 1988-05-02 | 1988-05-02 | Method and apparatus for sensing fluid flow volume to indicate end of filter life |
Publications (1)
Publication Number | Publication Date |
---|---|
US4918426A true US4918426A (en) | 1990-04-17 |
Family
ID=22696896
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US07/189,342 Expired - Lifetime US4918426A (en) | 1988-05-02 | 1988-05-02 | Method and apparatus for sensing fluid flow volume to indicate end of filter life |
Country Status (1)
Country | Link |
---|---|
US (1) | US4918426A (en) |
Cited By (59)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5089144A (en) * | 1989-12-08 | 1992-02-18 | Nartron Corporation | Filter condition indicator having moveable sensor and aggregate flow counter |
US5211024A (en) * | 1992-04-20 | 1993-05-18 | Spx Corporation | Refrigerant filtration system with filter change indication |
US5236578A (en) * | 1992-07-07 | 1993-08-17 | American Home Water Products Corporation | Filter life indicator for water purification system using magnetically actuated switch |
US5328597A (en) * | 1992-07-27 | 1994-07-12 | The Clorox Corporation | Electronic monitoring unit for monitoring number of uses of cartridge |
US5458766A (en) * | 1992-09-14 | 1995-10-17 | Yuasa Corporation | Life indicator and cartridge for indicating total water flow |
US5477731A (en) * | 1993-05-25 | 1995-12-26 | Societe Nationale D'etude Et De Construction De Moteurs D'aviation (S.N.E.C.M.A.). | Method and apparatus for detecting a fouled fluid filter |
US5499197A (en) * | 1994-04-05 | 1996-03-12 | Fou; Hsu-Chao | Intelligent and all-bearing control circuit device of reverse osmosis drinking water machine |
US5525214A (en) * | 1994-03-08 | 1996-06-11 | Recovery Engineering, Inc. | Filter cartridge for water treatment device |
US5527451A (en) * | 1994-03-08 | 1996-06-18 | Recovery Engineering, Inc. | Water treatment device with volume totalization valve |
US5536395A (en) * | 1993-03-22 | 1996-07-16 | Amway Corporation | Home water purification system with automatic disconnecting of radiant energy source |
WO1996024424A1 (en) * | 1995-02-10 | 1996-08-15 | Taprogge Gesellschaft Mbh | Cost-oriented control of a regenerable filter |
US5563351A (en) * | 1994-03-31 | 1996-10-08 | Caterpillar Inc. | Method and apparatus for determining pump wear |
US5576493A (en) * | 1993-11-19 | 1996-11-19 | Sowinski; Richard F. | Method and means for filtering contaminants from a gas stream to detect filter condition in situ |
US5676824A (en) * | 1994-09-30 | 1997-10-14 | Samsung Electronics Co., Ltd. | Water purifier with means for indicating when filter replacement is due and for automatically initiating a membrane washing step |
US5766487A (en) * | 1995-01-13 | 1998-06-16 | Ziba Design, Inc. | Method of visually indicating the ability of a filter element to remove particulates |
US5814212A (en) * | 1996-03-11 | 1998-09-29 | Hsu; Chao Fou | Monitoring process and device for an activated carbon filtration system of drinking water |
US5853599A (en) * | 1996-03-11 | 1998-12-29 | Hsu; Chao Fou | Monitoring process for a reverse osmosis purification system of drinking water |
US5858215A (en) * | 1996-12-06 | 1999-01-12 | Moen Incorporated | Water filter containing faucet and display therefor |
US5865991A (en) * | 1996-03-11 | 1999-02-02 | Hsu; Chao Fou | Monitoring system for a drinking water purification system |
US5871639A (en) * | 1996-03-11 | 1999-02-16 | Hsu; Chao Fou | Impurity filtration system for drinking water and monitoring device therefor |
US5873995A (en) * | 1997-05-06 | 1999-02-23 | The Clorox Company | End-of-life indicator for water treatment device |
US5882507A (en) * | 1996-04-30 | 1999-03-16 | Recovery Engineering, Inc. | Water filter cartridge end-of-life mechanism |
US5888381A (en) * | 1997-05-16 | 1999-03-30 | United States Filter Corporation | Water filter with pressure actuated flow monitor |
GB2333244A (en) * | 1998-01-14 | 1999-07-21 | Lucas Ind Plc | Sensors in fuel filter systems |
US5935426A (en) * | 1997-08-08 | 1999-08-10 | Teledyne Industries, Inc., A California Corporation | Water treatment device with volumetric and time monitoring features |
EP1030143A2 (en) * | 1999-02-18 | 2000-08-23 | CANDY S.p.A. | Cool water dispenser device for refrigerator |
US6149801A (en) * | 1997-08-08 | 2000-11-21 | Water Pik, Inc,. | Water treatment device with volumetric monitoring features |
US6186140B1 (en) | 1997-03-14 | 2001-02-13 | 3M Innovative Properties Company | Respiratory filter element having a storage device for keeping track of filter usage and a system for use therewith |
EP1106228A1 (en) * | 1999-12-06 | 2001-06-13 | Brita GmbH | Device for measuring water flow throughput |
DE19953376C1 (en) * | 1999-11-06 | 2001-07-05 | Braun Gmbh | Usage cycle and/or water throughput detector for drinks machines has sensor coupled to drive lever with protrusion driving indication wheel in dry region by suitable number of notches |
EP1139045A2 (en) * | 2000-03-31 | 2001-10-04 | CANDY S.p.A. | Refrigerator appliance with cool water dispensing unit |
US6319414B1 (en) * | 1997-10-05 | 2001-11-20 | Soda Club (Co2) Atlantic Gmbh | Water purifying and dispensing apparatus |
WO2002012835A2 (en) * | 2000-08-09 | 2002-02-14 | Honeywell International Inc. | Fluid-tight differential pressure flow sensor |
US6355177B2 (en) | 2000-03-07 | 2002-03-12 | Maytag Corporation | Water filter cartridge replacement system for a refrigerator |
US6386272B1 (en) | 2000-01-28 | 2002-05-14 | York International Corporation | Device and method for detecting fouling in a shell and tube heat exchanger |
US6402954B1 (en) * | 1997-12-01 | 2002-06-11 | O'keefe, Jr. Patrick J. | Method and apparatus for monitoring and cleaning a fluid filter system |
US6672147B1 (en) * | 1998-12-14 | 2004-01-06 | Magneti Marelli France | Method for detecting clogging in a fuel filter in an internal combustion engine supply circuit |
US20040036618A1 (en) * | 2001-12-28 | 2004-02-26 | Nanya Technology Corporation | Portable liquid level detector |
US20040069696A1 (en) * | 2002-09-09 | 2004-04-15 | William Warren | Single-use long-life faucet-mounted water filtration devices |
US20050092661A1 (en) * | 2002-09-09 | 2005-05-05 | William Warren | Single-use long-life faucet-mounted water filtration devices |
EP0808206B2 (en) † | 1995-02-10 | 2006-06-28 | ultrafilter international AG | Process and device for cost-oriented operation of a conditioning device, particularly a filter |
US20060249442A1 (en) * | 2005-04-01 | 2006-11-09 | Yap Walter N | Water filtration system with improved performance |
US20060289343A1 (en) * | 2005-06-17 | 2006-12-28 | Schmitt Craig A | Faucet assembly with water quality indicator |
US20070151905A1 (en) * | 2005-12-29 | 2007-07-05 | Metertek Technology Inc. | Water purifier |
WO2007138414A1 (en) | 2006-05-24 | 2007-12-06 | Preentec Ag | Device for automatic filter closure |
WO2008091845A1 (en) * | 2007-01-22 | 2008-07-31 | Ecowater Systems Llc | A water treatment system and process for a variable water flow rate and filter life monitoring algorithm and system |
US20090069948A1 (en) * | 2007-08-15 | 2009-03-12 | Sub-Zero, Inc. | System and method for controlling fluid flow |
WO2010093232A1 (en) * | 2009-02-12 | 2010-08-19 | Perez Monsrreal Jose Rogelio | Septic tank with self-cleaning filter and backflow for decanting and skimming |
US20120000858A1 (en) * | 2010-04-29 | 2012-01-05 | Andy Butler | Filter Life Pulsating Indicator and Water Filter System and Method |
DE102007034158B4 (en) * | 2007-07-21 | 2012-11-08 | Brita Gmbh | Device for the indirect measurement of the exhaustion of the filter medium of a filter |
WO2012158011A2 (en) | 2011-05-13 | 2012-11-22 | Perez Monsrreal Jose Rogelio | Biofilter for wastewater digestion |
US20130106097A1 (en) * | 2011-10-26 | 2013-05-02 | Kil Jae KIM | Structure for fastening outlet module of water purifier |
RU2520488C1 (en) * | 2013-02-25 | 2014-06-27 | Федеральное автономное учреждение "25 Государственный научно-исследовательский институт химмотологии Министерства обороны Российской Федерации" | Method to monitor lifetime of filtering element |
US9714654B2 (en) * | 2010-08-20 | 2017-07-25 | Xiamen Solex High-Tech Industries Co., Ltd. | Outlet device with collected outer sound to control the waterway |
US9976456B2 (en) | 2013-01-24 | 2018-05-22 | Cummins Filtration Ip, Inc. | Virtual filter condition sensor |
US10035131B2 (en) | 2011-11-24 | 2018-07-31 | Indian Institute Of Technology | Multilayer organic-templated-boehmite-nanoarchitecture for water purification |
US10041925B2 (en) | 2012-04-17 | 2018-08-07 | Indian Institute Of Technology | Detection of quantity of water flow using quantum clusters |
CN111760367A (en) * | 2020-06-19 | 2020-10-13 | 宁波帅风电器制造有限公司 | Filter element service life detection method and device, intelligent terminal and storage medium |
WO2023249951A1 (en) * | 2022-06-20 | 2023-12-28 | Delta Faucet Company | Electronic filter switch |
Citations (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2487679A (en) * | 1946-02-08 | 1949-11-08 | Stover Emory Frank | Integrating meter |
US3208278A (en) * | 1962-07-30 | 1965-09-28 | Robert A Herreman | Mileage indicator |
US3391575A (en) * | 1965-10-08 | 1968-07-09 | Foxboro Co | Compensated pressure differential measuring instrument |
US3635083A (en) * | 1969-09-26 | 1972-01-18 | Thomas R Vaughn | Fluid pressure time integrator |
US3714828A (en) * | 1970-10-26 | 1973-02-06 | G Durkan | Fluidic digital pneumotachometer |
US3889534A (en) * | 1972-03-24 | 1975-06-17 | Atomic Energy Authority Uk | Flowmeters |
US4121199A (en) * | 1975-09-08 | 1978-10-17 | Young Hurshel F | Sentinel system for grease extracting ventilators |
US4154586A (en) * | 1978-01-13 | 1979-05-15 | American Optical Corporation | Respirator cartridge end-of-service lift indicator system and method of making |
US4361050A (en) * | 1979-10-12 | 1982-11-30 | Thomson-Csf | Device for measuring the flow rate of a fluid and air flow sensor system in an internal combustion engine utilizing such a device |
US4406291A (en) * | 1980-04-07 | 1983-09-27 | Schwesinger Dennis W | Exhalation monitoring apparatus |
US4431533A (en) * | 1981-02-17 | 1984-02-14 | Standard Messgeratefabrik Gmbh | Filter for liquids, particularly for purifying drinking water |
US4522077A (en) * | 1982-06-28 | 1985-06-11 | Koeberle Karl | Flow measuring system including a venturi |
US4526041A (en) * | 1984-02-21 | 1985-07-02 | The Singer Company | Digital fluid flow rate sensor |
US4623451A (en) * | 1985-02-19 | 1986-11-18 | Oliver Bruce J | Third faucet system with above sink purity indicator |
US4769135A (en) * | 1987-03-02 | 1988-09-06 | Culligan International Company | Automatic metering system |
-
1988
- 1988-05-02 US US07/189,342 patent/US4918426A/en not_active Expired - Lifetime
Patent Citations (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2487679A (en) * | 1946-02-08 | 1949-11-08 | Stover Emory Frank | Integrating meter |
US3208278A (en) * | 1962-07-30 | 1965-09-28 | Robert A Herreman | Mileage indicator |
US3391575A (en) * | 1965-10-08 | 1968-07-09 | Foxboro Co | Compensated pressure differential measuring instrument |
US3635083A (en) * | 1969-09-26 | 1972-01-18 | Thomas R Vaughn | Fluid pressure time integrator |
US3714828A (en) * | 1970-10-26 | 1973-02-06 | G Durkan | Fluidic digital pneumotachometer |
US3889534A (en) * | 1972-03-24 | 1975-06-17 | Atomic Energy Authority Uk | Flowmeters |
US4121199A (en) * | 1975-09-08 | 1978-10-17 | Young Hurshel F | Sentinel system for grease extracting ventilators |
US4154586A (en) * | 1978-01-13 | 1979-05-15 | American Optical Corporation | Respirator cartridge end-of-service lift indicator system and method of making |
US4361050A (en) * | 1979-10-12 | 1982-11-30 | Thomson-Csf | Device for measuring the flow rate of a fluid and air flow sensor system in an internal combustion engine utilizing such a device |
US4406291A (en) * | 1980-04-07 | 1983-09-27 | Schwesinger Dennis W | Exhalation monitoring apparatus |
US4431533A (en) * | 1981-02-17 | 1984-02-14 | Standard Messgeratefabrik Gmbh | Filter for liquids, particularly for purifying drinking water |
US4522077A (en) * | 1982-06-28 | 1985-06-11 | Koeberle Karl | Flow measuring system including a venturi |
US4526041A (en) * | 1984-02-21 | 1985-07-02 | The Singer Company | Digital fluid flow rate sensor |
US4623451A (en) * | 1985-02-19 | 1986-11-18 | Oliver Bruce J | Third faucet system with above sink purity indicator |
US4769135A (en) * | 1987-03-02 | 1988-09-06 | Culligan International Company | Automatic metering system |
Cited By (88)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5089144A (en) * | 1989-12-08 | 1992-02-18 | Nartron Corporation | Filter condition indicator having moveable sensor and aggregate flow counter |
US5211024A (en) * | 1992-04-20 | 1993-05-18 | Spx Corporation | Refrigerant filtration system with filter change indication |
US5236578A (en) * | 1992-07-07 | 1993-08-17 | American Home Water Products Corporation | Filter life indicator for water purification system using magnetically actuated switch |
US5328597A (en) * | 1992-07-27 | 1994-07-12 | The Clorox Corporation | Electronic monitoring unit for monitoring number of uses of cartridge |
US5458766A (en) * | 1992-09-14 | 1995-10-17 | Yuasa Corporation | Life indicator and cartridge for indicating total water flow |
US5536395A (en) * | 1993-03-22 | 1996-07-16 | Amway Corporation | Home water purification system with automatic disconnecting of radiant energy source |
US5853572A (en) * | 1993-03-22 | 1998-12-29 | Amway Corporation | Home water purification system |
US5698091A (en) * | 1993-03-22 | 1997-12-16 | Amway Corporation | Home water purification system with filter end of life monitor |
US5477731A (en) * | 1993-05-25 | 1995-12-26 | Societe Nationale D'etude Et De Construction De Moteurs D'aviation (S.N.E.C.M.A.). | Method and apparatus for detecting a fouled fluid filter |
US5576493A (en) * | 1993-11-19 | 1996-11-19 | Sowinski; Richard F. | Method and means for filtering contaminants from a gas stream to detect filter condition in situ |
US5928504A (en) * | 1994-03-08 | 1999-07-27 | Recovery Engineering, Inc. | Faucet-mounted water treatment device |
EP0947231A1 (en) * | 1994-03-08 | 1999-10-06 | Recovery Engineering, Inc. | Water treatment device |
US5527451A (en) * | 1994-03-08 | 1996-06-18 | Recovery Engineering, Inc. | Water treatment device with volume totalization valve |
US5525214A (en) * | 1994-03-08 | 1996-06-11 | Recovery Engineering, Inc. | Filter cartridge for water treatment device |
US6241103B1 (en) | 1994-03-08 | 2001-06-05 | Recovery Engineering, Inc. | Filter cartridge for water treatment device |
US5563351A (en) * | 1994-03-31 | 1996-10-08 | Caterpillar Inc. | Method and apparatus for determining pump wear |
US5499197A (en) * | 1994-04-05 | 1996-03-12 | Fou; Hsu-Chao | Intelligent and all-bearing control circuit device of reverse osmosis drinking water machine |
US5676824A (en) * | 1994-09-30 | 1997-10-14 | Samsung Electronics Co., Ltd. | Water purifier with means for indicating when filter replacement is due and for automatically initiating a membrane washing step |
US5766487A (en) * | 1995-01-13 | 1998-06-16 | Ziba Design, Inc. | Method of visually indicating the ability of a filter element to remove particulates |
EP0808206B2 (en) † | 1995-02-10 | 2006-06-28 | ultrafilter international AG | Process and device for cost-oriented operation of a conditioning device, particularly a filter |
CN1072024C (en) * | 1995-02-10 | 2001-10-03 | 塔普罗格有限公司 | Cost-oriented control of a regenerable filter |
WO1996024424A1 (en) * | 1995-02-10 | 1996-08-15 | Taprogge Gesellschaft Mbh | Cost-oriented control of a regenerable filter |
US5814212A (en) * | 1996-03-11 | 1998-09-29 | Hsu; Chao Fou | Monitoring process and device for an activated carbon filtration system of drinking water |
US5871639A (en) * | 1996-03-11 | 1999-02-16 | Hsu; Chao Fou | Impurity filtration system for drinking water and monitoring device therefor |
US5865991A (en) * | 1996-03-11 | 1999-02-02 | Hsu; Chao Fou | Monitoring system for a drinking water purification system |
US5853599A (en) * | 1996-03-11 | 1998-12-29 | Hsu; Chao Fou | Monitoring process for a reverse osmosis purification system of drinking water |
US5882507A (en) * | 1996-04-30 | 1999-03-16 | Recovery Engineering, Inc. | Water filter cartridge end-of-life mechanism |
US6423224B1 (en) | 1996-04-30 | 2002-07-23 | The Procter & Gamble Company | Filter cartridge assembly for water treatment device |
US20040173507A1 (en) * | 1996-04-30 | 2004-09-09 | Pur Water Purification Products, Inc. | Water treatment device with fill-counting cartridge |
US6881327B2 (en) | 1996-04-30 | 2005-04-19 | Pur Water Purification Products | Water treatment device with fill-counting cartridge |
US5858215A (en) * | 1996-12-06 | 1999-01-12 | Moen Incorporated | Water filter containing faucet and display therefor |
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